title: Noise performance of a frequency nondegenerate phase-sensitive amplifier with unequalized inputs.
abstract: For the first time to our knowledge, the noise performance of a frequency nondegenerate phase-sensitive amplifier (PSA) with unequalized input powers has been experimentally characterized, based on a fiber-based parametric copier-PSA scheme. Two different noise-figure (NF) definitions-separate and combined NFs-are provided and compared. The results show that the separate NF of the weaker input wave is lower than that of the stronger wave due to the correlated-light nature. When considering the combined NF, the optimal noise performance (0 dB NF) is obtained only when the input powers are equal. Experiments agree well with the theoretical predictions.
authors.affiliation: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden. zhi.tong@chalmers.se
authors.forename: Z
authors.initials: Z
authors.lastname: Tong
authors.forename: C
authors.initials: C
authors.lastname: Lundström
authors.forename: M
authors.initials: M
authors.lastname: Karlsson
authors.forename: M
authors.initials: M
authors.lastname: Vasilyev
authors.forename: P A
authors.initials: PA
authors.lastname: Andrekson